Flexible piezoelectric nanogenerators based on PVDF-TrFE nanofibersLinda Serairi, Long Gu, Yong Qin, Yingxian Lu, Philippe Basset and Yamin Leprince-WangEur. Phys. J. Appl. Phys., 80 3 (2017) 30901DOI: https://doi.org/10.1051/epjap/2017170288